Perhaps you should try some spelling variations:
representation identity » representation creativity, representation entities, representation validity
representation equity » representation et, representation result, representational quality
commercial crops » commercial code, commercial credit, commercial banks
crops early » group's early
early send » early self, early sex, early senior

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: commercial crops early send ((representation equity) OR (representation identity)) studies.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "commercial crops early send ((representation equity) OR (representation identity)) studies.".
• Adding a wildcard symbol may retrieve word variants: commercial crops early send ((representation equity) OR (representation identity)) studies.*.